Gold-171
Properties and data of the isotope 171Au.
See also: list of Gold isotopes.
General data
Name of the isotope:Gold-171; Au-171Symbol:171Au or 17179AuMass number A:171 (= number of nucleons)Atomic number Z:79 (= number of protons)Neutrons N:92Isotopic mass:170.991882(22) u (atomic weight of Gold-171)Nuclide mass:170.9485489 u (calculated nuclear mass without electrons)Mass excess:-7.56187 MeVMass defect:1.4234678 u (per nucleus)Nuclear binding energy:1325.95171489 MeV (per nucleus)
7.7541036 MeV (average binding energy per nucleon)Separation energy:SN = 11.88(20) MeV MeV (first neutron)Half-life:22 μsDecay constant λ:31506.690025452 s-1Specific activity α:1.116104266844 × 10+26 Bq g-1
3.016498018499 × 10+15 Ci g-1Spin and parity:
(nuclear angular momentum)(1/2+)Year of discovery:1997
Radioactive Decay
Half-life T½ = 22 μs respectively 2.2 × 10-5 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
p | 170Pt | 100 % | | |
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
Nuclear Isomer | Excitation Energy | Half-life | Spin |
---|
171mAu | 259(13) keV | 1.04(3) ms | (11/2-) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 92) and isobaric (same nucleon number A = 171) with Gold-171. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 92 | Isobar A = 171 |
53 | 145I | |
54 | 146Xe | |
55 | 147Cs | |
56 | 148Ba | |
57 | 149La | |
58 | 150Ce | |
59 | 151Pr | |
60 | 152Nd | |
61 | 153Pm | |
62 | 154Sm | |
63 | 155Eu | |
64 | 156Gd | |
65 | 157Tb | 171Tb |
66 | 158Dy | 171Dy |
67 | 159Ho | 171Ho |
68 | 160Er | 171Er |
69 | 161Tm | 171Tm |
70 | 162Yb | 171Yb |
71 | 163Lu | 171Lu |
72 | 164Hf | 171Hf |
73 | 165Ta | 171Ta |
74 | 166W | 171W |
75 | 167Re | 171Re |
76 | 168Os | 171Os |
77 | 169Ir | 171Ir |
78 | 170Pt | 171Pt |
79 | 171Au | 171Au |
80 | 172Hg | 171Hg |
External data and identifiers
Last update: 2020-10-22
Perma link: https://www.chemlin.org/isotope/gold-171
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